Deoldify Vapoursynth filter

[Dan64]

I added dd_method to left room to add more Merge algorithms, SimpleMerge was simple and was the first, in the next release I will add AdaptiveMerge (dd_method = 1) and I hope to be able to add a TemporalChromaMerge (dd_method = 2). It was not my intention to remove the DeOldify only version. But given the good results obtained by merging the models, I proposed to define this setup as the default setup for Deoldify.

Thanks,
Dan